Cobalt-substitution-induced Superconductivity in a New Compound with ZrCuSiAs-type Structure, SrFeAsF

Abstract

We have synthesized a quaternary fluoroarsenide SrFeAsF with the ZrCuSiAs-type structure (P4/nmm, a = 0.3999 and c = 0.8973 nm), which is composed of an alternately stacked (FeAs)- and (SrF)+ layers, analogous to the FeAs-based superconductor LaFeAsO. SrFeAsF shows metallic type conduction with the anomaly at ~180 K. The partial replacement of the Fe with Co suppresses the anomaly and induces the superconductivity, while the maximal Tc (4 K for SrFe0.875Co0.125AsF) is much lower than that of the Co-substituted LaFeAsO. Replacement of (LaO)+ layers with (SrF)+ layers results in a enlargement of the c-axis length (+2.6%). These results suggest the importance of interlayer interaction as a critical Tc-controlling factor in FeAs-based superconductors.

arXiv commentJ. Phys. Soc. Jpn. in-press

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• High - Temperature Superconductivity in Iron Based Layered Compounds
• Magnetic structure of EuFe2As2 determined by single crystal neutron diffraction
• High-T_c superconductivity induced by doping rare earth elements into CaFeAsF
• A New ZrCuSiAs-Type Superconductor: ThFeAsN
• Orbital and spin effects for the upper critical field in As deficient disordered Fe pnictide superconductors
• Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF
• Magnetic order in CaFe1-xCoxAsF (x = 0, 0.06, 0.12) superconductor compounds
• Effect of 3d Transition Metal Doping on the Superconductivity in Quaternary Fluoroarsenide CaFeAsF
• Short- and long-range magnetic order in LaMnAsO
• Anion height dependence of Tc and density of states in iron based superconductors
• Iron Based Superconductors: Pnictides versus Chalcogenides
• Density Functional Study of the Over-Doped Iron Chalcogenide: TlFe${}_2$Se${}_2$ with ThCr${}_2$Si${}_2$ structure
• Comparison of crystal structures and effects of Co substitution in a new member of Fe-1111 superconductor family AeFeAsF(Ae = Ca and Sr): a possible candidate for higher Tc superconductor
• Superconductivity induced by hydrogen anion substitution in 1111-type iron arsenides
• Spin-phonon coupling and pressure effect in the superconductor LiFeAs : Lattice dynamics from first-principles calculations
• Study of the anisotropic magnetic order of the Eu sublattice in single crystals of EuFe_2-xCo_xAs_2 (x = 0, 0.2) by means of magnetization and magnetic torque
• Neutron diffraction study on phase transition and thermal expansion of SrFeAsF
• Effect of the tetrahedral distortion on the electronic properties of iron-pnictides
• Strong coupling between Eu2+ spins and Fe2As2 layers in EuFe1.9Co0.1As2 observed with NMR
• Effects of magnetic doping and temperature dependence on phonon dynamics in CaFe\_{1-x}Co\_{x}AsF compounds (x = 0, 0.06, 0.12)
• Two-dimensional magnetism in the pnictide superconductor parent material SrFeAsF probed by muon-spin relaxation
• Enhancing the three-dimensional electronic structure in 1111-type iron arsenide superconductors by H-substitution
• Muon-spin rotation and magnetization studies of chemical and hydrostatic pressure effects in EuFe_{2}(As_{1-x}P_{x})_{2}
• Striped antiferromagnetic order and electronic properties of stoichiometric LiFeAs from first-principles calculations
• Striped antiferromagnetism and electronic structures of SrFeAsF and their implications
• Upper critical field, critical current density and thermally activated flux flow in CaFFe0.9Co0.1As superconductor
• Antiphase magnetic boundaries in iron-based superconductors: A first-principle density-functional theory study
• Magnetisation distribution in the tetragonal phase of BaFe2As2
• Effects of Pressure on the Electronic and Structural Properties of LaOFeAs
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors
• Band structure of tetragonal and orthorhombic fluorine-arsenide SrFeAsF as a parent phases for a new group of oxygen-free FeAs superconductors